Improvement in wooden well-curbing



UNITED STATES .PATENT JOHN r. NAAs, oF sAN Jos, CALIFORNIA.

IMPROVEMENT IN WOODEN WE-LL-CURBING.

Specification forming part of Letters Patent No. 209,97 6, dated November 19, 1878 5 application led May 31, 1878.

To all whom it may concern:

Be it known that I, JOHN P. NAAS, of San Jos, county of Santa Clara, in the State of California, have invented an Improved Wooden Well-Curbiug 5 and I dohereby declare that the following is a full, clear, and exact description thereof, reference being had to certain drawings forming a part of this specification.

My invention has reference to wooden wellcurbs, such as are used for curbing bored wells by being forced down into the bore or well-hole behind the auger, and it relates to an improved manner of constructing the pipe or curb sections, so that they can be connected together strongly and form a tube of great rigidity, without any outside joint-fastenings or other projections to interfere with the free passage of the tube into the hole.

My improved wooden well-curb is made in a cylindrical form, and the sections are made of staves,'which are properly banded together with hoops. Each alternate stave projects at one end of each section, and the intermediate staves project at the opposite end, so

-that the extensions at one end will interlock with, iit into, and slide between the extensions of the next section, thus forming a pipe of great strength, having a uniform exterior and interior, all as hereinafter more fully described.

Referrin g to the accompanying drawings, Figure 1 is an elevation of the curb. Fig. 2 is an elevation of the curb, showing the parts detached. Figs. 3 and 4 are sections.

In the present instance I have represented three sections, A B C, of which the middle section, B, represents all of the sections of a well-curb except the upper and lower sections. A represents the top section, and C the lowermost section.

I will first describe the'` middle section, B, it being understood that any number of these sections can be connected together to form the main length of the curb.

Each section is made ot staves, which are all of a uniform length; but each alternate stave is made to project at 011e end of the section, while the intermediate staves are made to project at the opposite end, so as to form alternate projecting tingers or staves e and spaces f between them, at both ends of each section.

The edges of all the staves are beveled like ordinary barrel-staves, only they are straightv one end of one section are entered into the spaces f at one end of the next section, and the two are then pushed together until the extensions of one section slide into and fill the spaces of the other section, thus solidly interlocking the two.

The ends of the extensions e are rabbeted on their outer extremities, so that the rabbeted portion passes under the projecting. edge of the hoop, thus covering and concealing the joints. As many of these sections can be used as desired, according to the length of the curve or tube to b e made.

The lowermost section, C, has no extensions e on its lower end; but it is cut square off, and a circular metallic cutting-rim or end piece, h, is secured upon it, the inside of which is beveled to a sharpedge, as shown. The upper end of the uppermost or finishing section, A, is also cut square off, as shown, so that a perfectly smooth upper end is formed.

I am thus able to construct and use wooden well-curbin g with great facility and advantage. It makes a more desirable lining for wells than metal, and .is equally as convenient to spaces, and the extensions e being rabbeted v to tit under the projecting edges of the hoops,

Futon;

all combined and arranged to operate sub- In Witness whereof I hare hereunto set my stantially as above specified. hand and seal.

... In eombmatlou with the 1o eimost of, JOHN l). NAAS. [L S'j a series of interlocking sections or" a Wooden Well-curb, as described, the attached metallic Witnesses:

rim or edge h, substantially :LS and for the J. H. BLOOD, 1 purpose sei: forth. CHARLES D. COLE. 

